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Commit bb7bed08 authored by Heiko Carstens's avatar Heiko Carstens Committed by Ingo Molnar
Browse files

locking: Simplify spinlock inlining 



For !DEBUG_SPINLOCK && !PREEMPT && SMP the spin_unlock()
functions were always inlined by using special defines which
would call the __raw* functions.

The out-of-line variants for these functions would be generated
anyway.

Use the new per unlock/locking variant mechanism to force
inlining of the unlock functions like before. This is not a
functional change, we just get rid of one additional way to
force inlining.

Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Horst Hartmann <horsth@linux.vnet.ibm.com>
Cc: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: David Miller <davem@davemloft.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: <linux-arch@vger.kernel.org>
LKML-Reference: <20090831124418.848735034@de.ibm.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 892a7c67

include/linux/spinlock.h

+6 −40
Original line number Diff line number Diff line
@@ -259,50 +259,16 @@ static inline void smp_mb__after_lock(void) { smp_mb(); } 


#define spin_lock_irq(lock)		_spin_lock_irq(lock)

#define spin_lock_bh(lock)		_spin_lock_bh(lock)



#define read_lock_irq(lock)		_read_lock_irq(lock)

#define read_lock_bh(lock)		_read_lock_bh(lock)



#define write_lock_irq(lock)		_write_lock_irq(lock)

#define write_lock_bh(lock)		_write_lock_bh(lock)



/*

 * We inline the unlock functions in the nondebug case:

 */

#if defined(CONFIG_DEBUG_SPINLOCK) || defined(CONFIG_PREEMPT) || \

	!defined(CONFIG_SMP)

#define spin_unlock(lock)		_spin_unlock(lock)

#define read_unlock(lock)		_read_unlock(lock)

#define write_unlock(lock)		_write_unlock(lock)

#define spin_unlock_irq(lock)		_spin_unlock_irq(lock)

#define read_unlock_irq(lock)		_read_unlock_irq(lock)

#define write_unlock_irq(lock)		_write_unlock_irq(lock)

#else

# define spin_unlock(lock) \

    do {__raw_spin_unlock(&(lock)->raw_lock); __release(lock); } while (0)

# define read_unlock(lock) \

    do {__raw_read_unlock(&(lock)->raw_lock); __release(lock); } while (0)

# define write_unlock(lock) \

    do {__raw_write_unlock(&(lock)->raw_lock); __release(lock); } while (0)

# define spin_unlock_irq(lock)			\

do {						\

	__raw_spin_unlock(&(lock)->raw_lock);	\

	__release(lock);			\

	local_irq_enable();			\

} while (0)

# define read_unlock_irq(lock)			\

do {						\

	__raw_read_unlock(&(lock)->raw_lock);	\

	__release(lock);			\

	local_irq_enable();			\

} while (0)

# define write_unlock_irq(lock)			\

do {						\

	__raw_write_unlock(&(lock)->raw_lock);	\

	__release(lock);			\

	local_irq_enable();			\

} while (0)

#endif



#define spin_unlock_irqrestore(lock, flags)		\

	do {						\

include/linux/spinlock_api_smp.h

+12 −0
Original line number Diff line number Diff line
@@ -60,6 +60,18 @@ void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags) 
void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)

							__releases(lock);



/*

 * We inline the unlock functions in the nondebug case:

 */

#if !defined(CONFIG_DEBUG_SPINLOCK) && !defined(CONFIG_PREEMPT)

#define __always_inline__spin_unlock

#define __always_inline__read_unlock

#define __always_inline__write_unlock

#define __always_inline__spin_unlock_irq

#define __always_inline__read_unlock_irq

#define __always_inline__write_unlock_irq

#endif



#ifndef CONFIG_DEBUG_SPINLOCK

#ifndef CONFIG_GENERIC_LOCKBREAK